£143.81

Pricier than usual. £10 more than the 30-day average — we'd wait.

£144 today · 30-day average £134 · all-time low £129

Apera Instruments Apera GroStar Series GS1 pH Pen Tester Kit (Gen II) with Replaceable pH Probe for Hydroponics Water Quality Testing

Amazon

Price History & Forecast

Grey patches = out of stock. Cheaper = lower on the chart. Hover for exact prices.

Last 83 days · 83 data points (no recent data)

Historical
Generating forecast…
£144.85 £126.95 £130.86 £134.76 £138.67 £142.57 £146.48 18 July 2026 07 August 2026 28 August 2026 17 September 2026 08 October 2026
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Price Distribution

Price distribution over 83 days • 10 price levels

Days at Price
Current Price
7 days 2 days 15 days 10 days 21 days 8 days 3 days 5 days 9 days · current 3 days 0 5 11 16 21 £129 £130 £134 £135 £138 £140 £141 £143 £144 £145 Days at Price

Price Analysis

Most common price: £138 (21 days, 25.3%)

Price range: £129 - £145

Price levels: 10 different prices over 83 days

Description

Apera Instruments GroStar GS1 pH Pen (Gen II) is a lab-grade pH meter designed specifically for growers to easily manage crop success, featuring a replaceable double-junction pH probe and a grower-friendly workflow along with other intelligent functions and features that help reduce the guesswork and give you confidence in every measurement. Tester Kit contains: GroStar GS1, calibration solutions (pH 4.00 + pH 7.00, 50ml each), 3M KCl storage solution, 4 AAA batteries, lanyard.

Key Features

Lab-grade instrument designed specifically to meet growers' needs and habits

The replaceable glass bulb probe measures pH & temperature simultaneously while offering high accuracy and durability with minimal maintenance

Grower-friendly calibration workflow on an HD backlit screen allows you to finish 2-point calibration within a minute

Electrode condition indicator and calibration reminder function help you perform proper maintenance

TruRead measurement mode automatically generates the average, maximum, and minimum readings from multiple measurements, helping you to minimize the measurement error

Product Specifications

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